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75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
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/*
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* Copyright 2013, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef GMP_AUDIO_FRAME_h_
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#define GMP_AUDIO_FRAME_h_
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#include <stdint.h>
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#include "gmp-errors.h"
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#include "gmp-decryption.h"
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enum GMPAudioFormat
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{
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kGMPAudioEncodedSamples, // Raw compressed data, i.e. an AAC/Vorbis packet.
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kGMPAudioIS16Samples, // Interleaved int16_t PCM samples.
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kGMPAudioSamplesFormatInvalid // Should always be last.
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};
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class GMPAudioSamples {
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public:
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// The format of the buffer.
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virtual GMPAudioFormat GetFormat() = 0;
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virtual void Destroy() = 0;
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// MAIN THREAD ONLY
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// Buffer size must be exactly what's required to contain all samples in
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// the buffer; every byte is assumed to be part of a sample.
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virtual GMPErr SetBufferSize(uint32_t aSize) = 0;
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// Size of the buffer in bytes.
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virtual uint32_t Size() = 0;
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// Timestamps are in microseconds, and are the playback start time of the
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// first sample in the buffer.
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virtual void SetTimeStamp(uint64_t aTimeStamp) = 0;
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virtual uint64_t TimeStamp() = 0;
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virtual const uint8_t* Buffer() const = 0;
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virtual uint8_t* Buffer() = 0;
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// Get metadata describing how this frame is encrypted, or nullptr if the
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// buffer is not encrypted.
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virtual const GMPEncryptedBufferMetadata* GetDecryptionData() const = 0;
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virtual uint32_t Channels() const = 0;
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virtual void SetChannels(uint32_t aChannels) = 0;
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// Rate; the number of frames per second, where a "frame" is one sample for
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// each channel.
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//
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// For IS16 samples, the number of samples should be:
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// Size() / (Channels() * sizeof(int16_t)).
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//
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// Note: Channels() and Rate() may not be constant across a decoding
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// session. For example the rate for decoded samples may be different
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// than the rate advertised by the MP4 container for encoded samples
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// for HE-AAC streams with SBR/PS, and an EME-GMP may need to downsample
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// to satisfy DRM requirements.
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virtual uint32_t Rate() const = 0;
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virtual void SetRate(uint32_t aRate) = 0;
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};
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#endif // GMP_AUDIO_FRAME_h_
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